Folding chair



FIG. 1 is a perspective view from the front and left side of a folding chair showing my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a right side elevation thereof; and

FIG. 4 is a top plan view thereof.

The diagonal hatching represents a continuous piece of fabric. 

The ornamental design for a folding chair, substantially as shown and described. 